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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884b35757836b061f0e8e8c2c02a9850fea7b1ed06f9ac3ebbb5e3281b4d1394' 
  AND token = 'KS6PwPx3bROB/Gtu94GXgl2wcXj/a1G6IXKbnm8qlVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}